Lobe-finned fish, also known as Sarcopterygii, is an ancient type of fish with strong, bony fins that resemble limbs. While the name "lobe-finned fish" is commonly used to describe this group of fish, there are several other synonyms that are often employed as well. These include coelacanths, lungfish, and tetrapodomorphs. Coelacanths are a type of lobe-finned fish that were once believed to be extinct, but were discovered alive in the ocean in the 1930s. Lungfish, on the other hand, are able to breathe air in addition to absorbing oxygen through their gills. Overall, lobe-finned fish are an important part of our understanding of evolution and the history of life on Earth.